Dr. Paul is blood type O. His father was blood type A and his mother was blood type B.

What were the
genotypes of his parents and what are the possible blood types and ratios expected for crosses
involving Dr. Paul's parent's genotypes?

his research revealed two genetically different groups of prokaryotes, which justified splitting kingdom monera into two kingdoms. the genetic and cellular differences were so great, that these two kingdoms were eventually placed into different domains in the current three-domain system.